N. Korea says it fired anti-aircraft missile

North Korea said Friday it test-fired a new anti-aircraft missile, the fourth weapons launch in recent weeks that experts say is part of a strategy to win relief from sanctions and other concessions.

South Korea, Japan and the United States typically publicly confirm North Korean ballistic missile launches, which are banned by U.N. resolutions, soon after they occur. But they did not do so for Thursday’s, indicating the weapon tested may have been a different kind. Seoul’s Joint Chiefs of Staff said Friday that South Korean and U.S. intelligence authorities monitored moves by North Korea but didn’t elaborate.

Three weeks ago, North Korea resumed missile tests after a six-month lull. As it has sometimes done before, the North combined the show of force with a more conciliatory gesture, offering earlier this week to reactivate hotlines that North and South Korea use to set up meetings, arrange border crossings and avoid accidental clashes.